California Hazardous Substance Removal Contractor Licensing Exam Prep Book Reference Package

California Hazardous Substance Removal Contractor Licensing Exam Prep Book Reference Package

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California Hazardous Substance Removal Contractor Licensing Exam Prep Book Reference Package

Prepare for the California Hazardous Substance Removal certification examination with a focused book reference package covering hazardous substance project planning, estimating, regulatory requirements, hazardous material identification, site access control, removal methods, containment, remediation systems, waste disposal, underground storage tanks, excavation, trenching, personal protective equipment, permissible exposure limits, and job-site safety. This package brings together technical, regulatory, environmental, and safety references that support the major subjects covered by the California hazardous substance removal examination.

California treats hazardous substance removal as a certification added to an eligible existing contractor license rather than as a separate stand-alone contractor classification. Contractors who perform covered hazardous substance removal or remedial actions must satisfy the applicable certification requirements and pass the Hazardous Substance Removal certification examination. The certification is also required for contractors who install or remove underground storage tanks when the work falls under California's applicable requirements.

Hazardous substance removal work requires a combination of construction knowledge, environmental awareness, regulatory compliance, excavation skills, contamination control, waste-management knowledge, equipment selection, and worker protection. Candidates may need to evaluate a contaminated site, identify hazardous substances, establish controlled access, select protective equipment, choose appropriate tools, remove contaminated material, prevent migration, operate remediation systems, prepare waste for disposal, and safely work around underground storage tanks.

The California Hazardous Substance Removal examination is a closed-book examination. Reference books and study materials cannot be used during the test, so the materials in this package are intended for preparation before examination day. Candidates should use them to strengthen familiarity with federal hazardous-waste and worker-safety requirements, California underground storage tank regulations, leaking underground fuel tank guidance, underground utility notification practices, excavation safety, and Cal/OSHA requirements.

This book reference package can support candidates with different field backgrounds. An excavation contractor may need more preparation involving hazardous waste characterization, remediation systems, exposure limits, or disposal requirements. A contractor experienced with underground storage tanks may need additional study involving site control, waste operations, protective equipment, emergency response, or RCRA concepts. Balanced preparation is important because the examination covers planning, hazardous substance management, storage tanks, and safety.

What You Get

  • Code of Federal Regulations, OSHA Title 29, Part 1900-1910.999, Safety and Health Standards, Hazardous Waste Operations and Emergency Response, July 1, 2025
  • Leaking Underground Fuel Tank (LUFT) Guidance Manual, 2012 (Revised 2015)
  • Resource Conservation and Recovery Act (RCRA) Orientation Manual, 2014
  • Cal/OSHA General Industry & Electrical Safety Orders
  • Cal/OSHA Construction & Electrical Safety Orders
  • Underground Service Alert Guidelines
  • California Code of Regulations, Title 23, Division 3, Chapter 16, October 2018 Underground Storage Tank Regulations

Exam Details

The California Hazardous Substance Removal certification examination is divided into four major content areas. The official CSLB study guide applies to examinations scheduled on or after August 1, 2023.

  • Planning and Estimating — 21%
    This section includes planning hazardous substance projects, estimating hazardous substance projects, and understanding regulatory agencies and their requirements.
  • Hazardous Substance Management — 37%
    The largest examination section includes identifying hazardous substances, securing and controlling site access, selecting appropriate tools and equipment, removing hazardous substances, containing hazardous material migration, installing and operating remediation systems, determining proper waste disposal, and preparing and disposing of waste.
  • Storage Tanks — 21%
    This section includes installing and upgrading storage tanks, excavating for underground storage tanks, removing and disposing of storage tanks, and closing or abandoning storage tanks.
  • Safety — 21%
    This section covers job-site safety, personnel safety, excavation and trenching, permissible exposure limits, and selecting and using personal protective equipment.

The examination uses a multiple-choice format with four choices for each question and one best answer. Some questions require mathematical computation, and a calculator is provided during the examination.

There is no penalty for guessing, so candidates should attempt every question. Hazardous Substance Management represents approximately 37% of the examination and is the largest individual section. Planning and Estimating, Storage Tanks, and Safety each represent approximately 21%.

The examination outline shows why preparation should extend beyond hazardous material removal itself. Candidates must also understand regulatory agencies, site access, equipment selection, remediation systems, waste disposal, storage tank work, excavation, exposure limits, and worker protection.

Closed Book Test

The California Hazardous Substance Removal certification examination is a closed-book examination. Reference books and other study materials cannot be used during the test.

The OSHA hazardous waste operations material, LUFT Guidance Manual, RCRA Orientation Manual, Cal/OSHA safety orders, Underground Service Alert Guidelines, and California underground storage tank regulations should therefore be used during preparation rather than relied upon during the examination.

Active recall can be particularly useful for closed-book preparation. After studying a contaminated-site procedure, close the reference and explain how the site is evaluated, controlled, entered, monitored, remediated, and documented from memory.

The same method can be used for underground storage tanks. Review excavation, tank handling, removal, disposal, closure, and safety procedures, then explain the sequence without returning immediately to the reference.

When studying safety requirements, focus on understanding why a control is required. Candidates should be able to connect exposure hazards with appropriate protective equipment, monitoring, access restrictions, excavation controls, and work practices.

Licensing Steps

The California Contractors State License Board administers the Hazardous Substance Removal and Remedial Actions Certification. It is added to an eligible existing contractor license rather than issued as an independent contractor classification.

  1. Hold an eligible California contractor license. Eligibility is limited to contractors holding qualifying classifications recognized by CSLB for the hazardous substance removal certification.
  2. Identify the qualifying individual. The qualifying individual associated with the existing license is the person who completes the certification process and takes the required examination.
  3. Submit the Application for Hazardous Substance Removal and Remedial Actions Certification. The application is used to add the certification to an existing eligible California contractor license.
  4. Complete applicable application requirements. The applicant must provide the required business, license, classification, and qualifying individual information and complete other applicable CSLB processing requirements.
  5. Pass the Hazardous Substance Removal certification examination. The qualifying individual must pass the required closed-book examination when certification is sought.
  6. Maintain the underlying contractor license and applicable compliance requirements. The certification operates together with the contractor's existing classification and does not replace other permits, environmental requirements, safety rules, or agency approvals that may apply to a project.

Current CSLB eligibility for the certification includes contractors holding A General Engineering, B General Building, C-12 Earthwork and Paving, C-21 Building Moving/Demolition, C-36 Plumbing, C-57 Well Drilling, and qualifying C-61/D-40 Service Station Equipment and Maintenance licenses.

State Requirements

California law requires hazardous substance certification for contractors who perform covered hazardous substance removal or remedial actions. The requirement applies to the certification of contractors engaged in removal and remediation work and is separate from California's asbestos certification and C-22 Asbestos Abatement classification.

Hazardous substance removal and remedial action do not include asbestos-related work as defined under applicable California law. Asbestos work is regulated separately through asbestos-specific contractor licensing and certification requirements.

The hazardous substance certification is also required for a contractor who installs or removes an underground storage tank. A contractor who is not certified may contract for certain underground storage tank work only when the actual installation or removal is performed by a contractor who holds the required hazardous substance certification.

The certification operates in conjunction with an eligible underlying contractor classification. It does not create unlimited authority to perform unrelated construction work. Contractors must remain within the scope of their underlying license and meet applicable environmental, workplace safety, excavation, storage tank, waste, and agency requirements.

Hazardous substance projects may involve several regulatory agencies and legal frameworks. Candidates should therefore understand how contractor licensing requirements interact with hazardous waste regulation, underground storage tank requirements, occupational safety standards, environmental cleanup obligations, and utility-location practices.

Reference Books

  • Code of Federal Regulations, OSHA Title 29, Part 1900-1910.999, Safety and Health Standards, Hazardous Waste Operations and Emergency Response, July 1, 2025
    A federal occupational safety reference supporting study of hazardous waste operations, emergency response, exposure control, employee protection, training, site operations, protective equipment, and hazardous work environments.
  • Leaking Underground Fuel Tank (LUFT) Guidance Manual, 2012 (Revised 2015)
    A California guidance reference supporting preparation involving leaking underground fuel tanks, site investigation, contamination assessment, corrective action, cleanup planning, groundwater and soil concerns, and remediation.
  • Resource Conservation and Recovery Act (RCRA) Orientation Manual, 2014
    A federal hazardous-waste reference supporting study of hazardous waste regulation, identification, management, generator responsibilities, treatment, storage, disposal, and the broader regulatory structure governing waste.
  • Cal/OSHA General Industry & Electrical Safety Orders
    A California workplace safety reference supporting review of employee protection, electrical hazards, exposure control, equipment, hazardous materials, personal protective equipment, and occupational safety.
  • Cal/OSHA Construction & Electrical Safety Orders
    A California construction safety reference supporting preparation involving excavation, trenching, electrical hazards, heavy equipment, personal protective equipment, access control, and safe construction practices.
  • Underground Service Alert Guidelines
    A reference supporting preparation involving excavation planning, underground utility notification, marking, safe digging practices, and prevention of damage to buried facilities.
  • California Code of Regulations, Title 23, Division 3, Chapter 16, October 2018 Underground Storage Tank Regulations
    A California regulatory reference supporting study of underground storage tank installation, upgrading, operation, monitoring, closure, removal, and compliance requirements.

Test Information and Study Materials

For Planning and Estimating, candidates should begin by understanding the project scope. Hazardous substance work may require site assessment, environmental information, permits, agency notification, special equipment, worker protection, waste transportation, and disposal planning before field work begins.

Regulatory agencies and their requirements are specifically included in the examination outline. Candidates should understand that hazardous substance projects can involve contractor licensing requirements along with environmental, occupational safety, waste, storage tank, and local regulatory obligations.

Estimating should consider labor, protective equipment, excavation, containers, transportation, disposal, monitoring equipment, decontamination supplies, remediation equipment, and other project-specific requirements. Hazardous substance work may involve costs that are not typical of ordinary construction.

For Hazardous Substance Management, begin with identification. Candidates should understand that proper management depends on knowing what substance is present, its physical and chemical hazards, how it may migrate, and what handling or disposal requirements apply.

Securing and controlling site access is essential. Hazardous sites may require designated work zones, restricted entry, controlled personnel movement, decontamination procedures, and clear communication of hazards.

Tool and equipment selection should reflect the material, site conditions, removal method, contamination hazard, and worker-protection requirements. Candidates should connect equipment choice with the work being performed rather than treating equipment selection as a separate subject.

Removing hazardous substances may involve excavation, pumping, collection, containerization, treatment, or another remediation method. The appropriate approach depends on the contaminant, environmental medium, site conditions, and regulatory requirements.

Containing hazardous material migration is specifically included in the examination. Candidates should understand how contaminated soil, water, vapors, dust, or liquids can spread and how project controls can reduce that movement.

Remediation systems are also part of the examination. Review the purpose of systems used to control or remove contaminants and the need to monitor their operation and performance.

Waste disposal should be considered before removal begins. Candidates should understand the importance of proper identification, segregation, containerization, labeling, transportation, and disposal of waste.

The RCRA Orientation Manual can support broader understanding of hazardous waste regulation, while the LUFT Guidance Manual helps connect environmental concepts to leaking underground fuel tank cleanup.

For Storage Tanks, review installation, upgrading, excavation, removal, disposal, closure, and abandonment. Underground storage tank work combines construction, environmental protection, excavation safety, and regulatory compliance.

Before excavation, underground utility location is critical. The Underground Service Alert Guidelines can support study of notification, marking, safe excavation practices, and prevention of damage to buried facilities.

Excavating for an underground storage tank also requires attention to soil stability, access, equipment positioning, utilities, existing contamination, and worker exposure. Safety and environmental controls should be planned together.

Tank removal may involve residual product, contaminated soil, vapors, piping, and other hazards. Candidates should understand why tank work requires controlled procedures and careful coordination of environmental and safety requirements.

Closing or abandoning a storage tank is also included in the examination. Use the California underground storage tank regulations to strengthen understanding of tank-related compliance requirements.

For Safety, review job-site hazards, personnel protection, excavation and trenching, permissible exposure limits, and personal protective equipment.

Hazardous substance sites can expose workers through inhalation, skin contact, ingestion, or physical hazards. Candidates should understand how exposure routes influence the selection of controls and protective equipment.

Personal protective equipment should be selected according to the hazard and expected exposure. Candidates should understand the purpose of respiratory protection, protective clothing, gloves, eye protection, footwear, and other PPE associated with hazardous waste operations.

Permissible exposure limits are specifically included in the examination outline. Candidates should understand their role in worker exposure control and why monitoring, engineering controls, work practices, or PPE may be necessary when hazardous substances are present.

Excavation and trenching deserve focused preparation because many hazardous substance and storage tank projects involve work below grade. Review access, protective systems, utilities, heavy equipment, soil conditions, and other excavation hazards.

The federal hazardous waste operations and emergency response material and Cal/OSHA safety references can support deeper preparation involving worker training, protective equipment, hazardous operations, emergency conditions, and site safety.

Because the examination is closed book, active recall should be part of preparation. Study a hazardous substance project from planning through disposal, close the reference, and describe site control, removal, containment, waste preparation, transportation, and safety steps from memory.

Apply the same approach to underground storage tanks. Review installation or removal procedures and then explain excavation, utility location, tank handling, contamination control, closure, and worker protection without using the book.

Calculation practice should also be included because some examination questions require mathematical computation. Candidates should be prepared to work through trade-related estimating, excavation, quantity, and project calculations carefully.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps candidates prepare for the California Hazardous Substance Removal certification examination through organized study guidance, trade-focused review, structured reference navigation, and practice-oriented preparation. The book reference package supports the main examination areas of planning, hazardous substance management, storage tank work, and safety.

Reference navigation can help candidates focus on weaker areas. The federal OSHA material supports hazardous waste operations and worker protection, the RCRA Orientation Manual supports hazardous waste management, and the LUFT Guidance Manual supports leaking underground fuel tank remediation topics.

The California underground storage tank regulations support tank installation, upgrading, removal, and closure review, while the Underground Service Alert Guidelines reinforce excavation planning and buried utility awareness. The Cal/OSHA references support excavation, electrical, PPE, and general job-site safety.

Trade-focused preparation also helps connect the phases of hazardous substance work. Planning identifies the regulatory and technical requirements. Site control protects workers and the public. Removal and remediation address the contaminant. Waste preparation and disposal complete material management, while safety and exposure control apply throughout the project.

No exam preparation package can guarantee a passing examination result, certification approval, or authorization to perform hazardous substance removal work. Organized reference study can help candidates build stronger familiarity with the technical, environmental, regulatory, storage tank, excavation, and safety subjects covered by the California examination.

FAQ Section

What is the California Hazardous Substance Removal certification?

It is a certification added to an eligible existing California contractor license for contractors who perform covered hazardous substance removal or remedial actions. It is not a stand-alone contractor classification.

Is the California Hazardous Substance Removal examination open book?

No. The Hazardous Substance Removal certification examination is closed book. Reference materials cannot be used during the test.

What subjects are covered on the examination?

The examination covers Planning and Estimating, Hazardous Substance Management, Storage Tanks, and Safety.

What is the largest section of the examination?

Hazardous Substance Management is the largest section at approximately 37% of the examination.

Does the exam cover underground storage tanks?

Yes. Storage Tanks represents approximately 21% of the examination and includes installation, upgrading, excavation, removal, disposal, closure, and abandonment.

Does the examination include hazardous waste disposal?

Yes. Determining proper waste disposal and preparing and disposing of waste are included in Hazardous Substance Management.

Does the examination cover remediation systems?

Yes. Installing and operating remediation systems is included in the Hazardous Substance Management section.

Does the exam include excavation and trenching safety?

Yes. Excavation and trenching are specifically included in the Safety portion of the examination.

Does the examination include personal protective equipment?

Yes. Selecting and using personal protective equipment is specifically included in the Safety section.

Is hazardous substance removal the same as asbestos abatement?

No. California treats asbestos abatement separately. Hazardous substance removal and remedial action under this certification do not include asbestos-related work covered by California's asbestos-specific requirements.

Which contractor classifications are eligible for the certification?

Current CSLB eligibility includes A General Engineering, B General Building, C-12 Earthwork and Paving, C-21 Building Moving/Demolition, C-36 Plumbing, C-57 Well Drilling, and qualifying C-61/D-40 Service Station Equipment and Maintenance licenses.

Can I use the RCRA, LUFT, or underground storage tank references during the exam?

No. The examination is closed book. These references are intended for preparation before test day.

How should I use the Hazardous Substance Removal book reference package?

Organize preparation around project planning, regulatory agencies, hazardous substance identification, site control, removal, containment, remediation systems, waste disposal, underground storage tanks, excavation, exposure limits, PPE, and safety. Use the applicable OSHA, RCRA, LUFT, California storage tank, Underground Service Alert, or Cal/OSHA reference for deeper study, then practice recalling and applying the material without the books.